Security Exception in Checkstyle Package: Vulnerability in JavaLanguageParser
Summary
OSV-2025-570: Security exception in com.puppycrawl.tools.checkstyle.grammar.java.JavaLanguageParser.expr. Affects checkstyle versions >= 8a0f41b14d6ce557cef5b61b16802921264ca3e5, < 7557ec9d359021db44a75a14825e972a87090ae5. Fixed in 7557ec9d359021db44a75a14825e972a87090ae5. How to fix ↓
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Background
Checkstyle is an open-source tool designed to help developers adhere to coding standards in Java. It analyzes Java source code and provides feedback on code style, formatting, and potential errors. This vulnerability affects the JavaLanguageParser component, which is responsible for parsing Java code expressions. The vulnerability arises from a security exception that can lead to unexpected behavior during code analysis, potentially compromising the integrity of the tool.
Vulnerability Detail
The vulnerability identified as OSV-2025-570 is a security exception occurring in the JavaLanguageParser's expr method. It originates from a flaw in the parsing logic that can be exploited, leading to crashes or unintended behavior when processing certain Java expressions. The ramifications include potential denial of service, where the tool may become unresponsive, and risks associated with executing untrusted code. The crash state indicates that the issue arises during the writing process in the BufferedWriter class, which is part of the Java standard library.
How To Fix
Minimum fixed version
7557ec9d359021db44a75a14825e972a87090ae5
This is the first release that contains the fix.
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Workaround
As a temporary workaround, users can avoid processing potentially problematic Java expressions that may trigger the security exception until the package is updated. Additionally, implementing input validation to sanitize expressions before parsing can help mitigate the risk.
Conclusion
In summary, the identified vulnerability in the Checkstyle package poses a risk due to a security exception in the JavaLanguageParser. Users are encouraged to update to the patched version to mitigate the risk and ensure the integrity of their code analysis processes.
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FAQ
The vulnerability is a security exception in the JavaLanguageParser component of Checkstyle, which can lead to crashes during code analysis.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The vulnerability can cause denial of service, leading to unresponsiveness of the Checkstyle tool and risks associated with executing untrusted code.
Yes, a patch is available in the fixed version 7557ec9d359021db44a75a14825e972a87090ae5.
If you cannot update immediately, avoid processing potentially problematic Java expressions and implement input validation as a temporary measure.
References
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